class VagrantVbguest::Helpers::OsRelease::Parser
This class enables parsing of a string for key value pairs to be returned and stored in the Environment. It allows for variable substitutions and exporting of variables.
Constants
- LINE
Attributes
substitutions[R]
Public Class Methods
call(string)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 115 def call(string) new(string).call end
new(string)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 120 def initialize(string) @string = string @hash = {} end
Public Instance Methods
call()
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 125 def call @string.split(/[\n\r]+/).each do |line| parse_line(line) end @hash end
Private Instance Methods
expand_newlines(value)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 167 def expand_newlines(value) value.gsub('\n', "\n").gsub('\r', "\r") end
parse_line(line)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 134 def parse_line(line) if (match = line.match(LINE)) key, value = match.captures @hash[key] = parse_value(value || "") elsif line.split.first == "export" if variable_not_set?(line) raise FormatError, "Line #{line.inspect} has an unset variable" end elsif line !~ /\A\s*(?:#.*)?\z/ # not comment or blank line raise FormatError, "Line #{line.inspect} doesn't match format" end end
parse_value(value)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 147 def parse_value(value) # Remove surrounding quotes value = value.strip.sub(/\A(['"])(.*)\1\z/, '\2') if Regexp.last_match(1) == '"' value = unescape_characters(expand_newlines(value)) end if Regexp.last_match(1) != "'" self.class.substitutions.each do |proc| value = proc.call(value, @hash) end end value end
unescape_characters(value)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 163 def unescape_characters(value) value.gsub(/\\([^$])/, '\1') end
variable_not_set?(line)
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# File lib/vagrant-vbguest/helpers/os_release.rb, line 171 def variable_not_set?(line) !line.split[1..-1].all? { |var| @hash.member?(var) } end